123211031 has 2 divisors, whose sum is σ = 123211032. Its totient is φ = 123211030.

The previous prime is 123211021. The next prime is 123211037. The reversal of 123211031 is 130112321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123211031 - 2¹⁸ = 122948887 is a prime.

It is a super-2 number, since 2×123211031² = 30361916320165922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123210997 and 123211015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123211037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605515 + 61605516.

It is an arithmetic number, because the mean of its divisors is an integer number (61605516).

Almost surely, 2^123211031 is an apocalyptic number.

123211031 is a deficient number, since it is larger than the sum of its proper divisors (1).

123211031 is an equidigital number, since it uses as much as digits as its factorization.

123211031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 123211031 is about 11100.0464413443. The cubic root of 123211031 is about 497.6032374157.

Adding to 123211031 its reverse (130112321), we get a palindrome (253323352).

The spelling of 123211031 in words is "one hundred twenty-three million, two hundred eleven thousand, thirty-one".